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Fig. 10. Spectral phase shifts of magnostipes-complex EODs. (A) Example
reference EODs acquired as DC recordings of type I and type II males from the
Ivindo River (total duration of each trace=4 ms). (B) Multiple overlays, each
showing a phase-shifted EOD (red; type I from A) on top of one of the
unaltered, reference EODs (black). Phase shift angle is given as 
(see
text for details). The reference EOD is plotted in the polarity and temporal
alignment that minimizes the total squared deviation between it and the
phase-shifted EOD (i.e. it is allowed to invert freely; see asterisks). In the
left column of B, the type I EOD is compared to phase-shifted versions of
itself. In the right column, the phase-shifted type I EOD is compared to the
type II reference EOD. (C) Minimum total squared deviation (across ) for
best alignments between phase-shifted and reference EODs {i.e.
D[V(t), V(t)];
defined in the text}. All deviations are scaled from 0 to 1 for each family of
comparisons with a given pair of EODs across . Filled red squares are
from comparisons shown in B. The plot at the right also shows 15 randomly
selected comparisons between male EODs of the type I and type II morphs from
the Ivindo River. For each comparison, the type I EOD was phase shifted and
the type II EOD served as the reference (open squares) and vice versa
(filled circles). (D) Distribution of angles () providing the best fit
between phase-shifted male EODs of one morph and unaltered male EODs of the
other morph (for all comparisons in C, right plot).
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